Command Reference
ip dhcp relay information policy
To configure a Dynamic Host Configuration Protocol (DHCP) relay agent’s information reforwarding policy (what a DHCP relay agent should do if a message already contains relay information), use the ip dhcp relay information policy global configuration command. Use the no form of this command to restore the default relay information policy.
ip dhcp relay information policy {drop keep replace}
no ip dhcp relay information policy
Syntax Description
drop | Directs the DHCP relay agent to discard messages with existing relay |
| information if the relay information option is already present. |
keep | Indicates that existing information is left unchanged on the DHCP |
| relay agent. |
replace | Indicates that existing information is overwritten on the DHCP relay |
| agent. |
Defaults
The DHCP server replaces existing relay information.
Command Modes
Global configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 12.0(1)T.
This command is used by cable modem termination systems. When a DHCP relay agent receives a message from a another DHCP relay agent, relay information might already be present in the message. By default, the relay information from the previous relay agent is replaced.
Examples
The following examples configure a DHCP relay agent to drop messages with existing relay information, keep existing information, and replace existing information:
ip dhcp relay information policy drop
ip dhcp relay information policy keep
ip dhcp relay information policy replace
Related Commands
ip dhcp relay information check ip dhcp relay information option
34Release 12.0(1)T
